cmd/go: go list on a package with an empty file doesn't return deps

[stamblerre]

When a file in package is empty, go list fails with this error:

$ go list -e -json ~/mod1
{
	"Dir": "$HOME/rstambler/mod1",
	"ImportPath": "mod1",
	...
	"GoFiles": [
		"const.go",
		"mod1.go"
	],
	"Error": {
		"ImportStack": [
			"mod1"
		],
		"Pos": "",
		"Err": "\nmod2.go:1:1: expected 'package', found 'EOF'"
	}
}

Where mod1 contains files const.go, mod1.go, and mod2.go, the empty file. We had previously worked around this in go/packages (see CL 201220) by adding the file in the error message to the list of GoFiles. However, it has recently been noticed that this result is also missing the list of dependencies for the given package. Would it be possible for go list to return the correct list of deps for the other files in the package?

/cc @heschik @matloob

[gopherbot]

Change https://golang.org/cl/209978 mentions this issue: go/packages: revert "handle invalid files in overlays"

[gopherbot]

Change https://golang.org/cl/210097 mentions this issue: cmd/go: include imports in 'go list -e' output even after parse errors

[gopherbot]

Change https://golang.org/cl/210206 mentions this issue: go/packages: revert "handle invalid files in overlays"